Mix equal parts flour and water in a clean jar
Use about 50 g flour and 50 g water to start
Stir until no dry flour remains
Cover loosely with a lid or cloth
Leave at room temperature for 24 hours
Discard about half of the mixture
Feed with equal parts flour and water again
Stir well after each feeding
Repeat discarding and feeding every 24 hours
Use warm room temperature if possible
Switch to twice-daily feedings if it becomes very active
Continue until it doubles in size within 4 to 8 hours after feeding
Look for bubbles, a tangy smell, and a light airy texture
Keep feeding until the starter is strong and predictable
Store in the refrigerator once established
Feed before baking to wake it up and strengthen it